Crystal APM Advanced Pressure Module Manual de usuario descargar pdf (Pagina 9)

Communications  7

APM CPF Series Operation Manual

Command Processing

The data entered into the module is processed as follows:

•

Data is taken as 7-bit ASCII.

•

Characters are discarded if their decimal equivalent is less than 32 (space), except 10 (LF) and 13 (CR).

•

The most signicant data bit is ignored.

•

Upper or lower case is acceptable.

•

More than one command (Compound Commands) may be entered on one line. Commands are separated by semi-colons. For example,

PRES_UNIT KPA;FAULT?

Response Data Types

The data returned by the module can be divided into four types:

Integer

For most computers and controllers, integers are decimal numbers ranging from -32768 to 32768. For example, FAULT? could return an integer of 117. Refer

to the Error Codes table for more information on error codes.

Floating

Floating numbers have up to 5 signicant gures and exponents. For example, VAL? might return 25.345 PSI.

Character Response Data (CRD)

Character Response Data is data returned as keywords. For example, PRES_UNIT? might return PSI.

Indenite ASCII (IAD)

Indenite ASCII are any characters followed by a terminator. For example, *IDN might return CRYSTAL, APM003C, 678123, R130000.31/R08009.13.

Module Status

Error Queue

If an error occurs due to invalid input or buer overow, its error code is sent to a 15 entry error queue. An error code is read from the queue with the FAULT?

command. When the error queue is empty,

FAULT? returns 0. The error queue is cleared when power is reset or when the clear command *CLS is entered.

Input Buer

The module stores all received data in a 128 character input buer, which accommodates varying character input speeds.. If the input command/symbol

stream is too fast, the module will send the

XOFF command when the input buer is full. When the module is able to continue to receive commands, it will

generate the

XON command. The module can receive up to eight more characters after the XOFF command has been sent. If more characters are received, it

will stop receiving, clear the input buers, interrupt command execution, and ag the error

120 (Input Buer overow).

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